Multiple gas reservoirs are responsible for the gas emissions along the Marmara fault network

Type Article
Date 2018-07
Language English
Author(s) Ruffine LivioORCID1, Donval Jean-Pierre1, Croguennec Claire1, Burnard Pete2, 3, Lu Hailong4, Germain Yoan1, Legoix Ludovic N.1, 5, Bignon Laurent6, Cagatay M. Namik7, 8, Marty Bernard2, 3, Madre David2, 3, Pitel-Roudaut MathildeORCID1, Henry Pierre9, Geli LouisORCID1
Affiliation(s) 1 : IFREMER, Dept Ressources Phys & Ecosyst Fond Mer REM, Unite Geosci Marines, F-29280 Plouzane, France.
2 : CNRS, Unite Mixte Rech, Ctr Rech Petrograph & Geochim, F-54500 Vandoeuvre Les Nancy, France.
3 : Univ Lorraine, F-54500 Vandoeuvre Les Nancy, France.
4 : Peking Univ, Dept Energy & Sci, Coll Engn, Beijing 100871, Peoples R China.
5 : GEOMAR Helmholtz Ctr Ocean Res Kiel, Wischhofstr 1-3, D-24148 Kiel, Germany.
6 : IFREMER, Dept Ressources Phys & Ecosyst Fond Mer REM, Unite Rech & Dev Technol, F-29280 Plouzane, France.
7 : Istanbul Tech Univ, Fac Mines, EMCOL, TR-34469 Istanbul, Turkey.
8 : Istanbul Tech Univ, Fac Mines, Dept Geol Engn, TR-34469 Istanbul, Turkey.
9 : Aix Marseille Univ, CNRS, IRD, INRA,Coll France,CEREGE, Aix En Provence, France.
Source Deep-sea Research Part Ii-topical Studies In Oceanography (0967-0645) (Pergamon-elsevier Science Ltd), 2018-07 , Vol. 153 , P. 48-60
DOI 10.1016/j.dsr2.2017.11.011
WOS© Times Cited 8
Keyword(s) Abiotic CO2-source, Gas bubbles, Molecular and isotopic compositions, Primary and secondary methanogenesis, Sea of Marmara, Seeps, Thermogenic gases
Abstract

On continental margins, upward migration of fluids from various sources and various subsurface accumulations, through the sedimentary column to the seafloor, leads to the development of cold seeps where chemical compounds are discharged into the water column. MarsiteCruise was undertaken in November 2014 to investigate the dynamics of cold seeps characterized by vigorous gas emissions in the Sea of Marmara (SoM).

A previous paper published by Bourry et al. (2009) presented the gas geochemistry of three seeps sampled along three different segments in the SoM. Their findings showed that the seeps were sourced by three different reservoirs. In this paper, seventeen seeps were investigated to determine the gas sources, unravel reservoir contributions, and estimate their level of mixing. The molecular and stable isotope compositions of the gas compounds were determined to establish the empirical diagrams that usually allow to delineate source domains. The results provide insights into the complexities of source mixing within the sedimentary column of the SoM before emission of the gases into the water column. The seep gases originate from deep thermogenic or microbial hydrocarbon sources, or from a CO2-rich source. Microbial sources producing methane from primary methanogenesis have been identified in the Tekirdağ and the Çınarcık basins. In addition, six different thermogenic reservoirs or six different pathways of migration are responsible for the supply of gas to the seeps on the highs and in the western basin. Five of them are undergoing biodegradation followed by secondary methanogenesis, thereby providing additional sources of microbial methane to the seeps. Overall, the gases emitted by the seventeen seeps consist of variable mixtures of different components from two or three sources.

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Ruffine Livio, Donval Jean-Pierre, Croguennec Claire, Burnard Pete, Lu Hailong, Germain Yoan, Legoix Ludovic N., Bignon Laurent, Cagatay M. Namik, Marty Bernard, Madre David, Pitel-Roudaut Mathilde, Henry Pierre, Geli Louis (2018). Multiple gas reservoirs are responsible for the gas emissions along the Marmara fault network. Deep-sea Research Part Ii-topical Studies In Oceanography, 153, 48-60. Publisher's official version : https://doi.org/10.1016/j.dsr2.2017.11.011 , Open Access version : https://archimer.ifremer.fr/doc/00411/52203/